Without delay, let's solve this. We've got 426 and we will be multiplying it by 336, that is, adding 426 to itself 336 times.
Step 1: 0 + 426 = 426
Step 2: 426 + 426 = 852
Step 3: 852 + 426 = 1278
Step 4: 1278 + 426 = 1704
Step 5: 1704 + 426 = 2130
Step 6: 2130 + 426 = 2556
Step 7: 2556 + 426 = 2982
Step 8: 2982 + 426 = 3408
Step 9: 3408 + 426 = 3834
Step 10: 3834 + 426 = 4260
Step 11: 4260 + 426 = 4686
Step 12: 4686 + 426 = 5112
Step 13: 5112 + 426 = 5538
Step 14: 5538 + 426 = 5964
Step 15: 5964 + 426 = 6390
Step 16: 6390 + 426 = 6816
Step 17: 6816 + 426 = 7242
Step 18: 7242 + 426 = 7668
Step 19: 7668 + 426 = 8094
Step 20: 8094 + 426 = 8520
Step 21: 8520 + 426 = 8946
Step 22: 8946 + 426 = 9372
Step 23: 9372 + 426 = 9798
Step 24: 9798 + 426 = 10224
Step 25: 10224 + 426 = 10650
Step 26: 10650 + 426 = 11076
Step 27: 11076 + 426 = 11502
Step 28: 11502 + 426 = 11928
Step 29: 11928 + 426 = 12354
Step 30: 12354 + 426 = 12780
Step 31: 12780 + 426 = 13206
Step 32: 13206 + 426 = 13632
Step 33: 13632 + 426 = 14058
Step 34: 14058 + 426 = 14484
Step 35: 14484 + 426 = 14910
Step 36: 14910 + 426 = 15336
Step 37: 15336 + 426 = 15762
Step 38: 15762 + 426 = 16188
Step 39: 16188 + 426 = 16614
Step 40: 16614 + 426 = 17040
Step 41: 17040 + 426 = 17466
Step 42: 17466 + 426 = 17892
Step 43: 17892 + 426 = 18318
Step 44: 18318 + 426 = 18744
Step 45: 18744 + 426 = 19170
Step 46: 19170 + 426 = 19596
Step 47: 19596 + 426 = 20022
Step 48: 20022 + 426 = 20448
Step 49: 20448 + 426 = 20874
Step 50: 20874 + 426 = 21300
Step 51: 21300 + 426 = 21726
Step 52: 21726 + 426 = 22152
Step 53: 22152 + 426 = 22578
Step 54: 22578 + 426 = 23004
Step 55: 23004 + 426 = 23430
Step 56: 23430 + 426 = 23856
Step 57: 23856 + 426 = 24282
Step 58: 24282 + 426 = 24708
Step 59: 24708 + 426 = 25134
Step 60: 25134 + 426 = 25560
Step 61: 25560 + 426 = 25986
Step 62: 25986 + 426 = 26412
Step 63: 26412 + 426 = 26838
Step 64: 26838 + 426 = 27264
Step 65: 27264 + 426 = 27690
Step 66: 27690 + 426 = 28116
Step 67: 28116 + 426 = 28542
Step 68: 28542 + 426 = 28968
Step 69: 28968 + 426 = 29394
Step 70: 29394 + 426 = 29820
Step 71: 29820 + 426 = 30246
Step 72: 30246 + 426 = 30672
Step 73: 30672 + 426 = 31098
Step 74: 31098 + 426 = 31524
Step 75: 31524 + 426 = 31950
Step 76: 31950 + 426 = 32376
Step 77: 32376 + 426 = 32802
Step 78: 32802 + 426 = 33228
Step 79: 33228 + 426 = 33654
Step 80: 33654 + 426 = 34080
Step 81: 34080 + 426 = 34506
Step 82: 34506 + 426 = 34932
Step 83: 34932 + 426 = 35358
Step 84: 35358 + 426 = 35784
Step 85: 35784 + 426 = 36210
Step 86: 36210 + 426 = 36636
Step 87: 36636 + 426 = 37062
Step 88: 37062 + 426 = 37488
Step 89: 37488 + 426 = 37914
Step 90: 37914 + 426 = 38340
Step 91: 38340 + 426 = 38766
Step 92: 38766 + 426 = 39192
Step 93: 39192 + 426 = 39618
Step 94: 39618 + 426 = 40044
Step 95: 40044 + 426 = 40470
Step 96: 40470 + 426 = 40896
Step 97: 40896 + 426 = 41322
Step 98: 41322 + 426 = 41748
Step 99: 41748 + 426 = 42174
Step 100: 42174 + 426 = 42600
Step 101: 42600 + 426 = 43026
Step 102: 43026 + 426 = 43452
Step 103: 43452 + 426 = 43878
Step 104: 43878 + 426 = 44304
Step 105: 44304 + 426 = 44730
Step 106: 44730 + 426 = 45156
Step 107: 45156 + 426 = 45582
Step 108: 45582 + 426 = 46008
Step 109: 46008 + 426 = 46434
Step 110: 46434 + 426 = 46860
Step 111: 46860 + 426 = 47286
Step 112: 47286 + 426 = 47712
Step 113: 47712 + 426 = 48138
Step 114: 48138 + 426 = 48564
Step 115: 48564 + 426 = 48990
Step 116: 48990 + 426 = 49416
Step 117: 49416 + 426 = 49842
Step 118: 49842 + 426 = 50268
Step 119: 50268 + 426 = 50694
Step 120: 50694 + 426 = 51120
Step 121: 51120 + 426 = 51546
Step 122: 51546 + 426 = 51972
Step 123: 51972 + 426 = 52398
Step 124: 52398 + 426 = 52824
Step 125: 52824 + 426 = 53250
Step 126: 53250 + 426 = 53676
Step 127: 53676 + 426 = 54102
Step 128: 54102 + 426 = 54528
Step 129: 54528 + 426 = 54954
Step 130: 54954 + 426 = 55380
Step 131: 55380 + 426 = 55806
Step 132: 55806 + 426 = 56232
Step 133: 56232 + 426 = 56658
Step 134: 56658 + 426 = 57084
Step 135: 57084 + 426 = 57510
Step 136: 57510 + 426 = 57936
Step 137: 57936 + 426 = 58362
Step 138: 58362 + 426 = 58788
Step 139: 58788 + 426 = 59214
Step 140: 59214 + 426 = 59640
Step 141: 59640 + 426 = 60066
Step 142: 60066 + 426 = 60492
Step 143: 60492 + 426 = 60918
Step 144: 60918 + 426 = 61344
Step 145: 61344 + 426 = 61770
Step 146: 61770 + 426 = 62196
Step 147: 62196 + 426 = 62622
Step 148: 62622 + 426 = 63048
Step 149: 63048 + 426 = 63474
Step 150: 63474 + 426 = 63900
Step 151: 63900 + 426 = 64326
Step 152: 64326 + 426 = 64752
Step 153: 64752 + 426 = 65178
Step 154: 65178 + 426 = 65604
Step 155: 65604 + 426 = 66030
Step 156: 66030 + 426 = 66456
Step 157: 66456 + 426 = 66882
Step 158: 66882 + 426 = 67308
Step 159: 67308 + 426 = 67734
Step 160: 67734 + 426 = 68160
Step 161: 68160 + 426 = 68586
Step 162: 68586 + 426 = 69012
Step 163: 69012 + 426 = 69438
Step 164: 69438 + 426 = 69864
Step 165: 69864 + 426 = 70290
Step 166: 70290 + 426 = 70716
Step 167: 70716 + 426 = 71142
Step 168: 71142 + 426 = 71568
Step 169: 71568 + 426 = 71994
Step 170: 71994 + 426 = 72420
Step 171: 72420 + 426 = 72846
Step 172: 72846 + 426 = 73272
Step 173: 73272 + 426 = 73698
Step 174: 73698 + 426 = 74124
Step 175: 74124 + 426 = 74550
Step 176: 74550 + 426 = 74976
Step 177: 74976 + 426 = 75402
Step 178: 75402 + 426 = 75828
Step 179: 75828 + 426 = 76254
Step 180: 76254 + 426 = 76680
Step 181: 76680 + 426 = 77106
Step 182: 77106 + 426 = 77532
Step 183: 77532 + 426 = 77958
Step 184: 77958 + 426 = 78384
Step 185: 78384 + 426 = 78810
Step 186: 78810 + 426 = 79236
Step 187: 79236 + 426 = 79662
Step 188: 79662 + 426 = 80088
Step 189: 80088 + 426 = 80514
Step 190: 80514 + 426 = 80940
Step 191: 80940 + 426 = 81366
Step 192: 81366 + 426 = 81792
Step 193: 81792 + 426 = 82218
Step 194: 82218 + 426 = 82644
Step 195: 82644 + 426 = 83070
Step 196: 83070 + 426 = 83496
Step 197: 83496 + 426 = 83922
Step 198: 83922 + 426 = 84348
Step 199: 84348 + 426 = 84774
Step 200: 84774 + 426 = 85200
Step 201: 85200 + 426 = 85626
Step 202: 85626 + 426 = 86052
Step 203: 86052 + 426 = 86478
Step 204: 86478 + 426 = 86904
Step 205: 86904 + 426 = 87330
Step 206: 87330 + 426 = 87756
Step 207: 87756 + 426 = 88182
Step 208: 88182 + 426 = 88608
Step 209: 88608 + 426 = 89034
Step 210: 89034 + 426 = 89460
Step 211: 89460 + 426 = 89886
Step 212: 89886 + 426 = 90312
Step 213: 90312 + 426 = 90738
Step 214: 90738 + 426 = 91164
Step 215: 91164 + 426 = 91590
Step 216: 91590 + 426 = 92016
Step 217: 92016 + 426 = 92442
Step 218: 92442 + 426 = 92868
Step 219: 92868 + 426 = 93294
Step 220: 93294 + 426 = 93720
Step 221: 93720 + 426 = 94146
Step 222: 94146 + 426 = 94572
Step 223: 94572 + 426 = 94998
Step 224: 94998 + 426 = 95424
Step 225: 95424 + 426 = 95850
Step 226: 95850 + 426 = 96276
Step 227: 96276 + 426 = 96702
Step 228: 96702 + 426 = 97128
Step 229: 97128 + 426 = 97554
Step 230: 97554 + 426 = 97980
Step 231: 97980 + 426 = 98406
Step 232: 98406 + 426 = 98832
Step 233: 98832 + 426 = 99258
Step 234: 99258 + 426 = 99684
Step 235: 99684 + 426 = 100110
Step 236: 100110 + 426 = 100536
Step 237: 100536 + 426 = 100962
Step 238: 100962 + 426 = 101388
Step 239: 101388 + 426 = 101814
Step 240: 101814 + 426 = 102240
Step 241: 102240 + 426 = 102666
Step 242: 102666 + 426 = 103092
Step 243: 103092 + 426 = 103518
Step 244: 103518 + 426 = 103944
Step 245: 103944 + 426 = 104370
Step 246: 104370 + 426 = 104796
Step 247: 104796 + 426 = 105222
Step 248: 105222 + 426 = 105648
Step 249: 105648 + 426 = 106074
Step 250: 106074 + 426 = 106500
Step 251: 106500 + 426 = 106926
Step 252: 106926 + 426 = 107352
Step 253: 107352 + 426 = 107778
Step 254: 107778 + 426 = 108204
Step 255: 108204 + 426 = 108630
Step 256: 108630 + 426 = 109056
Step 257: 109056 + 426 = 109482
Step 258: 109482 + 426 = 109908
Step 259: 109908 + 426 = 110334
Step 260: 110334 + 426 = 110760
Step 261: 110760 + 426 = 111186
Step 262: 111186 + 426 = 111612
Step 263: 111612 + 426 = 112038
Step 264: 112038 + 426 = 112464
Step 265: 112464 + 426 = 112890
Step 266: 112890 + 426 = 113316
Step 267: 113316 + 426 = 113742
Step 268: 113742 + 426 = 114168
Step 269: 114168 + 426 = 114594
Step 270: 114594 + 426 = 115020
Step 271: 115020 + 426 = 115446
Step 272: 115446 + 426 = 115872
Step 273: 115872 + 426 = 116298
Step 274: 116298 + 426 = 116724
Step 275: 116724 + 426 = 117150
Step 276: 117150 + 426 = 117576
Step 277: 117576 + 426 = 118002
Step 278: 118002 + 426 = 118428
Step 279: 118428 + 426 = 118854
Step 280: 118854 + 426 = 119280
Step 281: 119280 + 426 = 119706
Step 282: 119706 + 426 = 120132
Step 283: 120132 + 426 = 120558
Step 284: 120558 + 426 = 120984
Step 285: 120984 + 426 = 121410
Step 286: 121410 + 426 = 121836
Step 287: 121836 + 426 = 122262
Step 288: 122262 + 426 = 122688
Step 289: 122688 + 426 = 123114
Step 290: 123114 + 426 = 123540
Step 291: 123540 + 426 = 123966
Step 292: 123966 + 426 = 124392
Step 293: 124392 + 426 = 124818
Step 294: 124818 + 426 = 125244
Step 295: 125244 + 426 = 125670
Step 296: 125670 + 426 = 126096
Step 297: 126096 + 426 = 126522
Step 298: 126522 + 426 = 126948
Step 299: 126948 + 426 = 127374
Step 300: 127374 + 426 = 127800
Step 301: 127800 + 426 = 128226
Step 302: 128226 + 426 = 128652
Step 303: 128652 + 426 = 129078
Step 304: 129078 + 426 = 129504
Step 305: 129504 + 426 = 129930
Step 306: 129930 + 426 = 130356
Step 307: 130356 + 426 = 130782
Step 308: 130782 + 426 = 131208
Step 309: 131208 + 426 = 131634
Step 310: 131634 + 426 = 132060
Step 311: 132060 + 426 = 132486
Step 312: 132486 + 426 = 132912
Step 313: 132912 + 426 = 133338
Step 314: 133338 + 426 = 133764
Step 315: 133764 + 426 = 134190
Step 316: 134190 + 426 = 134616
Step 317: 134616 + 426 = 135042
Step 318: 135042 + 426 = 135468
Step 319: 135468 + 426 = 135894
Step 320: 135894 + 426 = 136320
Step 321: 136320 + 426 = 136746
Step 322: 136746 + 426 = 137172
Step 323: 137172 + 426 = 137598
Step 324: 137598 + 426 = 138024
Step 325: 138024 + 426 = 138450
Step 326: 138450 + 426 = 138876
Step 327: 138876 + 426 = 139302
Step 328: 139302 + 426 = 139728
Step 329: 139728 + 426 = 140154
Step 330: 140154 + 426 = 140580
Step 331: 140580 + 426 = 141006
Step 332: 141006 + 426 = 141432
Step 333: 141432 + 426 = 141858
Step 334: 141858 + 426 = 142284
Step 335: 142284 + 426 = 142710
Step 336: 142710 + 426 = 143136

So, 426*336 = 143136